Boost ringing on FXS ports or IP phone system analog ports that are weak or fail Boost ring power on analog PABX/KSU stations that are weak or fail Reshapes troublesome distorted ringing signals True Sine wave ring signal output Boosts ring to 4 REN Caller ID compatible Easy RJ-21X installation Compatible with distinctive ringing services Will not affect normal line operation Reshapes troublesome square wave ringing Fax and modem compatible Not compatible with pulse dialing
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